FreeBSD Man Pages

GEM(4) FreeBSD Kernel Interfaces Manual GEM(4)
NAMEgem -- ERI/GEM/GMAC Ethernet device driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your
kernel configuration file:
devicemiibusdevicegem
Alternatively, to load the driver as a module at boot time, place the
following line in loader.conf(5):
if_gem_load="YES"
DESCRIPTION
The gem driver provides support for the GMAC Ethernet hardware found
mostly in the last Apple PowerBooks G3s and most G4-based Apple hardware,
as well as Sun UltraSPARC machines.
All controllers supported by the gem driver have TCP checksum offload
capability for both receive and transmit, support for the reception and
transmission of extended frames for vlan(4) and a 512-bit multicast hash
filter.
HARDWARE
Chips supported by the gem driver include:
+o Apple GMAC
+o Sun ERI 10/100 Mbps Ethernet
+o Sun GEM Gigabit Ethernet
The following add-on cards are known to work with the gem driver at this
time:
+o Sun Gigabit Ethernet PCI 2.0/3.0 (GBE/P) (part no. 501-4373)
+o Sun Gigabit Ethernet SBus 2.0/3.0 (GBE/S) (part no. 501-4375)
NOTES
On sparc64 the gem driver respects the local-mac-address? system configu-
ration variable which can be set in the Open Firmware boot monitor using
the setenv command or by eeprom(8). If set to ``false'' (the default),
the gem driver will use the system's default MAC address for all of its
devices. If set to ``true'', the unique MAC address of each interface is
used if present rather than the system's default MAC address.
Supported interfaces having their own MAC address include the on-board
Sun ERI 10/100 Mbps on boards equipped with more than one Ethernet inter-
face and the Sun Gigabit Ethernet 2.0/3.0 GBE add-on cards.
SEE ALSOaltq(4), miibus(4), netintro(4), vlan(4), eeprom(8), ifconfig(8)HISTORY
The gem device driver appeared in NetBSD 1.6. The first FreeBSD version
to include it was FreeBSD 5.0.
AUTHORS
The gem driver was written for NetBSD by Eduardo Horvath
<eeh@NetBSD.org>. It was ported to FreeBSD by Thomas Moestl
<tmm@FreeBSD.org> and later on improved by Marius Strobl
<marius@FreeBSD.org>. The man page was written by Thomas Klausner
<wiz@NetBSD.org>.
FreeBSD 10.2 December 25, 2009 FreeBSD 10.2